I just disabled on mine, could definitely tell a difference. It was a bit too quiet, so I then wired open the exhaust valves. That made it a bit better, but overall it could definitely use more sound.
So if you have stock exhaust (even comp package), consider leaving it enabled. With the top down and exhaust valves wired open it's actually ok, but with the top up it's really quiet.
RichardP - I have B&O, no change to any of the sounds.
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